(19)
(11) EP 0 341 190 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.11.1990 Bulletin 1990/47

(43) Date of publication A2:
08.11.1989 Bulletin 1989/45

(21) Application number: 89630087.8

(22) Date of filing: 05.05.1989
(51) International Patent Classification (IPC)4: G06K 11/12
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 06.05.1988 US 190762

(71) Applicant: SCRIPTEL HOLDING, INC.
Columbus Ohio 43228 (US)

(72) Inventors:
  • Schlosser, Philip A.
    Columbus Ohio 43220 (US)
  • Kable, Robert G.
    Dublin Ohio 43017 (US)

(74) Representative: Waxweiler, Jean et al
Dennemeyer & Associates Sàrl P.O. Box 1502
1015 Luxembourg
1015 Luxembourg (LU)


(56) References cited: : 
   
       


    (54) Electrographic apparatus


    (57) The electrographic apparatus of a variety wherein a transparent resistive layer is deposited upon an insultive substrate in a manner wherein a rectangularly-shaped resistive layer region is developed having a predetermined conductivity. A conduction band is provided about the periphery of the resistive layer region having a value of conductivity enhanced with respect to the conductivity value of the resistive layer. Discrete resistive elements are positioned intermediate the conduction band and the resistive region and four terminals are provided, one at each of the four corners of the rectangular resistance region. The discrete resistance elements are designed so that a uniform impedance is witnessed with respect to the resistive layer region as witnessed with respect to each of the four terminals. The control system for the device provides for development of coordinate pair information and includes a non-volatile memory retained configurational data for initial set-up of the apparatus by the opertor.







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